W. NR. 1.2767
Characteristics
Chrome–nickel–tungsten–molybdenum steel for hardening in the airflow with the high hardenability. The steel is characterized by a relatively high hardness after hardening, especially good toughness against the stress by pressure of shocks and hits, very good resistance to the wear and rather good dimensional stability at the heat treatment. It is rather difficult to form the steel at the heat and it shows relatively more difficult workability in the soft-annealed state.
Suitability
For tools for hot work such as small dies requiring high toughness at the high hardness, e.g. by working of material of high hardness. Further the steel is suitable for knives during the cold cutting of materials of thick thicknesses, knives for scrap etc. and for highly stressed tools for cold punching. For pressing of plastics from this steel it is possible to produce big breeze blocks and harden them in air.
Chemical composition of steel W.Nr. 1.2767
| Steel grade | Chemical composition in % | Hardness in the state | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| soft-annealed | heat-treated | ||||||||||||
| C | Mn | Si | Cr | W | Mo | V | Ni max | Co | P max. | S max. | HB max. | HRC min. | |
| DIN X45NiCrMo4 | 0,40-0,50 | 0,15-0,45 | 0,10-0,40 | 1,20-1,50 | 0,15-0,35 | 3,80-4,30 | 0,030 | 0,030 | 248 | 44 | |||
| ČSN 19 655 | 0,35-0,45 | 0,40-0,70 | 0,20-0,40 | 1,40-1,80 | 0,40-0,80 | 0,20-0,40 | 3,80-4,60 | 0,030 | 0,035 | 285 | 50 | ||
Heat treatment of steel W.Nr. 1.2767
| Way | Temperature [°C] | Procedure | |
|---|---|---|---|
| Forging | 850-1050 | Cool slowly in calm air or better e.g. in dry ash or other thermally-insulated material | |
| Soft annealing | 610-650 | Warm few hours (according to the size of object), mostly four hours are enough and cool slowly in the furnace | |
| Annealing to lower tension | 600-630 | Warm 1 to 2 hours and cool slowly in the furnace | |
| Hardening | 830-860 | Bigger and more rugged tools | |
| 840-870 | Cool in oil up to 180-220 °C | ||
| Tempering | 160-250 | Cool in air, the degree of tempering is set by hardness and toughness of instrument according to the tempering chart | |
Note
Chart of tempering values depending on the hardness:
| °C | 100 | 200 | 300 | 400 | 500 | 600 |
|---|---|---|---|---|---|---|
| HRC | 56 | 54 | 50 | 46 | 42 | 38 |
Graph
Product range
Round bars: D21 - D373
Blocks: 460x1010
We will deliver any semi-finished products from the above mentioned dimensions. Other dimensions, except for given stock supplies, have to be consulted with us.
